Error obtaining UI hierarchy and Screen not available

Question

I use Android Device Monitor to check my Android App view hierarchy.

Run the app in android studio's device simulator.

Open the Android Device Monitor.

Then choose my App and Dump View Hierarchy for UI Automator, but I get this,

I also try to Screen Capture the App, and I get this,

Android studio 2.3.3 on Mac OS Sierra v10.12.5